Which of the Following Statements Is the Most Accurate

Which of the following statements is the most accurate?

A) The U.S. and Canadian dollar have traded roughly at par since 1970.
B) The exchange rate (U.S.$ per Canadian $) has always been less than one since 1970.
C) The U.S. and Canadian dollar traded roughly at par in the early 1970s and as of 2006, is nearing par as the Canadian dollar rises.
D) The U.S. and Canadian dollar traded roughly at par in the early 1970s and as of 2006, is nearing par as the Canadian dollar falls.
E) None of the above.